Our initial #GrapheneOS release based on Android 15 is now available for early testing for technical users willing to sideload the release to their device. It's a regular production release and this can be done on a locked device with USB debugging disabled, but it's not heavily tested yet.
If you're interested in helping with either the early testing via sideloading or regular public testing via our Alpha and Beta channels, join our public testing chat:
https://grapheneos.org/contact#community-chat
You can choose between Matrix, Discord, IRC or Telegram. Most people use Matrix or Discord.